Chin J Plant Ecol ›› 2023, Vol. 47 ›› Issue (12): 1684-1692.DOI: 10.17521/cjpe.2022.0488

• Research Articles • Previous Articles     Next Articles

Characteristics of population structure and dynamics in endangered Camellia granthamiana

LIN Chun-Hui1,2, GU Hui-Yi1, YE Qin-Liang3, ZHANG Zhi-Jian3, ZHONG Zhi-Ming3, YI Qi-Fei1,2,*()   

  1. 1Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
    2Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
    3Guangdong Zijin Baixi Provincial Nature Reserve Administrate Office, Zijin, Guangdong 517400, China
  • Received:2022-12-05 Accepted:2023-07-06 Online:2023-12-20 Published:2023-07-06
  • Contact: *(
  • Supported by:
    Supported by Research and Development Program in Key Areas of Guangdong Province(2022B1111040003);Forestry Science and Technology Project of Guangdong Province(202006012)


Aims The study investigated the population structure of wild Camellia granthamiana, and examined its regeneration processes and grwoth development, for purpose of guiding conservation and sustainable utilization of the species.
Methods The structure and dynamics of two populations of C. granthamiana in Zijin, Guangdong, were studied with a static life table, dynamic indices, survival curves, population function curves, and the method of time sequence prediction.
Important findings 1) The two populations of C. granthamiana displayed pyramidal structures with high proportion of young individuals; the young individuals (I to II age class) of the Luzizhang and Yangmeiba populations accounted for 71.48% and 64.32% of the total, respectively, with a high mortality rate. 2) The survival curves of the two populations tended to be in the form of Deevey-II, indicating that the mortality rates in different age classes were similar. 3) The numerical dynamic index ignoring the external interference (Vpi) and that accounting for the external interference (V′pi) are both greater than zero in the two populations, with V′pi approaching zero, suggesting unstable population growth. The Yangmeiba population was relatively more stable. 4) The survival function analysis shows that the survival rate and cumulative mortality of the two populations reached a balance between the age classes of I to II; after the age class of V, the survival curve changed slightly, and limited number of individuals began to enter the physiological decline stage. 5) It is predicted that the number of individuals in each age class will increase in different degrees after 2, 4, 6 and 8 age classes in the future. In summary, the mortality rate of young individuals in the population of C. granthamiana is high, but there is still a certain potential for renewal. In the field investigation, it was found that the human disturbance had a great impact on the population of C. granthamiana. Therefore, for conservation and sustainable utilization of the natural populations of this endangered species, cutting should be strictly prohibited, and both ex situ and in situ protections of the seedlings are advisable.

Key words: Camellia granthamiana, population structure, static life table, survival function, time sequence prediction